Combining a bright f/2 aperture with a 4-stop Optical Image Stabilizer, this 335g lens enables sharp handheld shooting in low light that unstabilized 35mm primes cannot match. Its ring-type USM motor delivers fast, near-silent autofocus and full-time manual override, making it equally capable for stills and video work. This lens is best for documentary photographers and videographers using full-frame Canon DSLRs who need a stabilized, walk-around wide-angle prime.